I thinks it happened because those players wanted to win the world cup no mater what happen. Also its looks like a trap made by Italy team and player did not think about the situation he just had fallen into the trap.
Playing in the world cup finals is a dream of every football player but in the finals they have to handle lot of presser because they do not just play for them self they play for their country and lot of people depending on them.So I thinks this kind of things happen because of the presser.